Interference between two superfluid Fermi gases
Interference between two superfluid Fermi gases
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DOI：
10.1088/0953-4075/46/3/035302
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发表时间：
2013-01
期刊：
影响因子：
--
通讯作者：
Wen Wen-Wen;Hui-jun Li
中科院分区：
文献类型：
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作者：
Wen Wen-Wen;Hui-jun Li
本文研究了双势阱中释放的超流费米气体对玻色-爱因斯坦凝聚（BEC）极限和么正性极限的干涉。对于两个初始耦合的费米超流体，我们发现了清晰的非均匀干涉条纹的形成，条纹间距随演化时间线性增长，条纹的扩展速度从BEC极限到幺正极限显著增加.然而，对于两个空间分离的费米超流体，我们表明，在强相互作用的制度，干涉图案的特点是复杂的空间结构。通过研究不同双阱势强度下的么正性极限干涉，发现这些复杂结构实际上是由于横向不稳定性导致的自发涡旋环的形成。
We investigate the interference of the superfluid Fermi gases released from a double-well potential in the crossover from the unitarity limit to the Bose–Einstein condensate (BEC) limit. For two initially coupled Fermi superfluids, we show the formation of the clear and nonuniform interference fringes, in which the fringe spacing grows linearly in the evolution time, and the expansion velocity of the fringes increases significantly from the BEC limit to the unitarity limit. For two spatially separated Fermi superfluids, however, we show that in the strongly interacting regime, the interference patterns are characterized by the complicated spatial structures. By studying the interferences in the unitarity limit under different values of the strength of the double-well potential, we find that these complicated structures actually originate from the formations of spontaneous vortex rings, due to the transverse instability.